ABB LTU785 Terminal Unit

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Product Introduction

The LTU-785 Terminal Unit by ABB is designed for low-voltage or industrial control system applications. Its primary role is to interface field devices (sensors, actuators, measurement signals) with PLC/DCS/SCADA systems, ensuring reliable signal transmission, status monitoring and communications control. With a compact build and industrial-grade robustness, it is suited for demanding operating environments.

Key Technical Specifications

The following specifications are for reference only; please refer to the latest official ABB documentation for final data:

• Model: LTU-785 (Part Number SM9-3055.061.00)

• Product Type: Low-Voltage Terminal Unit

• Power Supply Input: 24 V DC (typical)

• Output Type: Relay contacts

• Communication Protocols: Supports Modbus RTU and IEC 60870-5-103 (per some sources)

• Operating Temperature Range: –40 °C to +85 °C

• Dimensions (typical): 120 × 75 × 35 mm (W × H × D)

• Weight: approx. 3.0 kg

• Certifications: CE, RoHS (per some sources)

• Origin: Sweden

Advantages & Features

1. Industrial-grade wide temperature range: Operates from –40 °C to +85 °C, suitable for extreme temperature environments and enhancing system reliability.

2. Flexible communication: Equipped with Modbus/IEC60870 protocols for seamless integration with PLC, DCS, SCADA systems.

3. Compact form-factor and easy installation: Small dimensions facilitate installation in control cabinets or field enclosures, saving space.

4. High-reliability relay outputs: Relay contact outputs can drive a wide range of field devices or alarm systems, enhancing system scalability.

5. Brand assurance: ABB brand product backed by global service network, facilitating spare parts and service support.

6. Strong compatibility and expandability: Suitable for a variety of industrial automation scenarios, supporting modular expansion and signal interfacing.

Typical Application Fields

• Power system automation: Substations, distribution network, monitoring and communication signal interfacing.

• Petrochemical and chemical industry: Process control signal integration and field instrumentation connection.

• Manufacturing automation: Production line monitoring, equipment status acquisition, factory SCADA systems.

• Building and infrastructure: Building automation systems, environment monitoring, energy management.

• Transportation and municipal engineering: Tunnels, rail transit, water supply/drainage monitoring systems.

Precautions / Notes

• Before installation, confirm the supply voltage is 24 V DC and ensure stable power input.

• Wiring and relay output loads must comply with the device’s rated specifications; avoid overload usage.

• In environments with high temperature, humidity, vibration or strong electromagnetic interference, appropriate protective measures (such as shielding, grounding, and isolation) should be taken.

• For communication networks (Modbus, IEC60870) setup, configure address, baud rate, data format etc. correctly to avoid communication conflicts.

• It is recommended to leave spare capacity for expansion to facilitate future module addition or signal increases.

• Regularly inspect the relay contact status, connection tightness, and device cooling/ventilation to ensure long-term reliable operation.

The structure and details of the product：

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